@at19649sta Line 4b is the taxable amount of an IRA distribution. TurboTax usually pulls this number from Form 1099-R, box 2a, taxable amount.
Sometimes the taxable amount will be "not determined." For example, if you have contributed after-tax money to your IRA, then part of your withdraw may be free from tax because you took out pre- and after-tax money, TurboTax will ask you about your "IRA basis," the amount of any after-tax money your contributed. This is rare. Most people contribute to a Traditional IRA to tax a tax deduction in the year of contribution.
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